A transparent block shaped accurately to reverse curvatures of the components it is used to test. By contacting an accurately finished negative lens shape with a newly made positive, the conformity of the latter to the ideal can be easily observed....

Metrology is the science and practice of measurement. It encompasses the theoretical and practical aspects of measurement,...

A photometer that permits visual comparison of the luminance of two surfaces.

A microscope that has been modified to permit the quantitative analysis of dust samples.

An optical system that rapidly alternates two similar pictures or scenes to permit the detection of small dissimilarities...

A room that is light-tight, permitting total darkness or illumination with a safelight when working with photosensitive...

A meniscus that is often fitted before a camera lens to permit focusing on near objects.

A device that permits only electrons within a narrow velocity range to pass through it, while rejecting those above and...

An interface in an optical network that permits an optical signal to pass without changing the optical signal to an...

The section of crystal symmetry having only one-quarter of the greatest number of faces permitted by the crystal system of...

A charge-coupled device (CCD) is a type of electronic image sensor used in various imaging devices, including digital...

1. The decrease of the absorption (or gain) coefficient of a medium near some transition frequency when the power of the...

Lithography is a key process used in microfabrication and semiconductor manufacturing to create intricate patterns on the...

A microscope designed with two eyepieces (oculars), permitting the use of both eyes when viewing through the instrument.

Instrumentation designed to permit the perception, recording or measurement of scenes under conditions of low incident...

A surgical device used to deliver laser light. Specifically,contact tips are made with artificially grown sapphire which is...

Micro-LED (micro-light-emitting diode) refers to a technology that involves the use of very small light-emitting diodes to...

A camera that permits adjustments in the perspective of an image; this is accomplished by the camera design, which permits...

1. The characteristic of how light propagates through a waveguide that can be designated by a radiation pattern in a plane...

Epitaxial deposition is a process used in semiconductor manufacturing and materials science to grow a thin crystalline...

A device that permits the adjustment of facsimile transmitters and recorders so that their scanning lines stop and start at...

Although low in sensitivity (approximately 10-7 m for helium-neon lasers), this holographic technique permits quantitative...

The cutting of pitch tooling surfaces by an optical technician to permit polishing compounds to flow across the surface of...

A lamp, usually incandescent, that has a very compact filament, permitting a greater concentration of emitted light, aided...

An optical data storage device that permits the user to store data (write) and play it back (read), but not to erase or...

Computerized lens design algorithm that permits the lens MTF characteristic to be included and controlled during the...

A magnetic-deflection mass spectrometer that has an electrostatic field placed perpendicularly to its magnetic field,...

A form of Cassegrain telescope having a concave hyperbolic primary and a convex hyperbolic secondary. This form permits the...

1. The term used to describe any of the many instruments used to remotely record physical dimensions, such as strain,...

The internal lens of the eye. It is semielastic to permit changes in its power when focusing on objects at near distances.

A bulk crystalline optic which permits the propagation of light through a volume of index altered material. The variation in...

Aspect of vision permitting the observer to distinguish among stimuli by their hue, saturation, and brightness or lightness.

A method of data multiplexing that can provide large, instantaneous bandwidths for busy traffic while permitting slow...

A form of high-power microscope objective where the space between the object and the first element is filled with an oil...

Noise created by patterns imaged on a CCD surface. Pixel sensitivity is altered by responsivity during illumination.

A polished plano-parallel plate that is contacted to an unpolished glass surface to permit see-through analysis of the...

1. In the eye, the opening in the iris that permits light to pass and be focused on the retina. 2. In a lens, the image of...

An optical testing instrument is a device or system used to evaluate and measure the performance, quality, and...

A type of telescope mount that permits direct azimuth and elevation adjustments.

An oil immersion condenser used to permit only light that has been diffracted or dispersed by a microscope specimen to enter...

1. Attribute of a visual sensation that permits a judgment to be made of the amount of pure chromatic color present. 2. The...

A circuit that permits feedback in an electronic device.

When splitting the output of a single optical fiber into two or more fibers, the difference in the maximum loss between any...

A support device in which a column or chamber of air permits the free travel of a mobile part. In optical mounting and...

A system that is complete and self-contained, needing no further additions to permit its operation.

Also called shining. Grinding and polishing one surface of a blank to permit a more thorough examination for quality.

A manufacturing process used to construct substrates for large optical components. Used with IR materials, planform bonding...

Optical coatings are thin layers of materials applied to optical components, such as lenses, mirrors, filters, and prisms,...

A lens assembly containing several movable elements to permit changing of the effective focal length (EFL). Unlike a zoom...

One eyepiece of a set having equal distances from their mounting interface to their image plane, permitting freedom to...

A support for optical parts comprising a solid bed that permits precise longitudinal movement of one component relative to...

Machine vision lighting refers to the use of specific lighting techniques and equipment in the field of machine vision,...

A polishing machine designed to permit adjustment of the polisher speed and motion for the control of flat surfaces.

The properties of certain materials that cause them to have relative permeabilities that exceed unity. This permeability...

An optical instrument designed to permit the visual examination of the interior of the bronchi.

A means of determining a prism's index of refraction by placing the prism so that its emergent face is perpendicular to the...

The number of electrons that can share a principal quantum number by preventing identity between any two electrons' four...

The portion of a glow discharge tube that permits little or no light transmission.

A process in which a mixture of one or more monomers, plus a catalyst, polymerize under exposure to light radiation....

Metamaterials are artificial materials engineered to have properties not found in naturally occurring substances. These...

A device for the internal inspection of hard-to-get-at mechanical parts, such as rifle barrels, sewer pipes, oil wells, or...

1. A mechanism that permits the focusing of an optical system.2. A means of obtaining the sharpest image from a cathode-ray...

When applied to LCD grids, the active matrix is a means of supplying power to pixels by use of a transistor and capacitor....

Technology that relies on a highly efficient photodetector that can detect incoming light signals at one frequency and...

A group of four cameras loaded with different combinations of filters and film (one is usually an infrared color film) to...

1. A contour map of a photographic deposit consisting of lines and curves that join points of equal density. 2. The...

A camera equipped with a lens and a long length of perforated film, the latter being moved intermittently between exposures...

Thin-film deposition equipment refers to machinery and tools used in the process of depositing thin layers of material onto...

Beam profiling is a technique used to characterize and analyze the spatial intensity distribution of a laser beam. It...

An optical device that permits the alignment of a gun, cannon or rocket launcher system with its target.

A cryogenic cooler device that is an intermittent Joule-Thomson refrigerator with a passive radiator serving as the...

A series of high contrast block letters or similar objects arranged to permit the evaluation of eyesight in humans.

An incandescent or carbon arc lamp designed with a stable and compact arc or filament that permits it to be used as a light...

1. An eyepiece or magnifier with a scale at its image plane. That scale is placed in contact with an object, permitting...

An instrument capable of precise measurements of the Earth's gravity. This permits the detection of small changes in local...

A device small enough to be held in a hand that uses a magnifying lens and a translucent back to permit the viewing of...

An optical mounting device that permits adjustment around two perpendicular and intersecting axes of rotation.

A pulsed interferometer that permits the continuous quantitative mapping of the surface deformation of an adaptive optical...